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'C. KNOTH.

GRINDING MACHINE.

7 APPLICATION man AUG-I0, 1920.

1,389,311. PatentedAug. 30,1921;

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GRINDLNG MACHINE.

APPLICATION FILED AUG.I0, I920.

1,3893 1 1 Patented Au 30,-192'1.

3 SHEETS-SHEET 2.

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C. KNOTH..

GRINDING MACHINE.

APPLICATION FILED AUG-t0, 1920.

Patented Aug. 30,1921.

' 3 SHEETS-SHEET 3.

lNVEN'TO ATTORNEY UNITED STATES CONRAD KNOTH OF HILLSIDE, NEW JERSEY, ASSIGNOR T0 H 7 DIVISION, GENERAL MOTORS CORIE'ORATION, OF HARRISO A CORPORATION OF NEW YORK.

PATENT OFFICE.

YATT BEARINGS 1v, NEW JERSEY,

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Aug. 30, 1921.

Application filed August 10, 1920. Serial No. 402,682.

To all whom it may concern:

.Be it known that I, CONRAD. KNoTH, a citizen of the United States, residing at 38 Mertz avenue, Hillside, county of Union and State of New Jersey, have invented certain new and useful Improvements in Grindlng- Machines, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to means for grinding the interior of circular shells or sleeves such as are used in roller-bearings and other structures, to furnish a smooth and perfect wearing surface.

The application of a steel sleeve to the axle or casing of a roller-bearmg is used to furnish a hardened surface for the roll-seats, and such sleeves required to be ground-after hardening.

The object of the invention is to support the sleeve and grinder-wheel more rigidly during the grinding operation, and to permit a considerable overhang ofthe grinder-wheel spindle so that it may extend within sleeves of considerable length during the grinding operation.

These objects are attained by the means shown in the annexed drawing, in which Figure 1 is a side elevation of the grinding mechanism; Fig. 2 is a plan of the same;

Fig. 3 shows the end of the bearing for the grinder-spindle; Fig. 4: is a section of the parts on line /l4 in Fig. 7; F1g. 5 1s a cross-section on line 5-5 of Fig. 7.; 'Flg. 6 of a plan of the bearing and nozzle for the grinder-spindle; and Fig. .7 1s a slde view of the nozzle with a portion broken away to tialto the operation of the grinder.

The mechanism for supporting and operating the grinder is necessarily shown in connection with a grinding machine, only that part being described herein, as is essential to the opertaion of the grmder.

In" Fig. 1 the bed A is shown carrying at Y the left-hand the chuck-driverhead B, and

at the right-hand end the grinder-carrying head 0 with a carriage c supporting the grinder-wheel and the driving-motor D.

' arbor D Chuck support.

The outer side of the cup is fitted to rotate in a bearing F upon the head B, and its shaft is fitted to a bearing E upon the head, ata suitable distance from the bearing F to permit the application of a belt I or other driving agent, to the exterior of the cup, whlch is shown provided with a pulley J for such belt. Such a support for the chuck wholly prevents any chattering or vibration of the sleeve or grinder, the sleeve.

H lying wholly within the bearing F.

The detachable lining G has a taper fit within the cup and is formed with a collar or shoulder M in its rear end, at a suitable distance from the front end of the chuck to admit the sleeve to be ground, with its front end projectin slightly from the chuck.

The sleeve Ii is held in the chuck during the grinding operation by a collar M fitted to a thread upon the front end of the chuck, and the collars are made to clear the grinder 7) when moving through the sleeve.

The carriage is movable on the head 0 transverse to thechuck F, and carries bearings f and g for the grinder-spindle 7).

Lost motion of the grinder-spindle a is prevented by the use of specially designed offset bearings fitted within a tubular nozzle (Z which projects from its bearing 03' suiiis ciently to carry the grinder-wheel into the entire length of the sleeve to be ground, (see dotted lines (Z in Figs. 1 and 2).

The offset bearings are formed of halfcollars or bushings f and g with one-half f fastened by screws f within the nozzle d near each end, and the other halves g adjacent and intermediate to the first.

The halves g are held loosely by screws 9 and springs e are seated in the exterior of these halves and cause such halves to press the spindle 5 into the halves f.

The grinder-spindle is pressed laterally always in the same direction, when grinding (away from the surface being ground), and the halves f are arranged to sustain all of this thrust, so that none of such pressure falls upon the valves 9.

Only one-half of the spindles periphery is embraced by each half-bearing, and the spindle opposite such bearing or g) is entirely exposed to lubrication, which is supplied freely to the interior of the nozzle d, and is retained opposite each halfbearing by a fibrous pad h, thus supplying lubricant to the spindles surface where the entire strain is imposed.

The spring pressure of the halves 9 against the spindle a wholly prevents any chattering of the grinder and consequent roughening of the ground surface. An oilinlet Z is provided on the nozzle to lubricate the bearings of the spindle, and is closed by plug.

Coupling of spindle to motor.

The spindle b and motor-spindle are provided with coupling sections 2' and j, which are held together as long as the nozzle d is clamped in the bearing cl; but the cap of the latter is detachable and is connected with the base of the hearing by links 72, and cams it connected by handle ]L2.

The handle is shown in plan in Fig. 6 and in end-view in Fig. 3, and when pressed down it looks the cap firmly upon the bearing and grips the nozzle cZ tightly.

The provision of the cams prevents any wear or lost motion of the nozzle in the bearing, as they press the parts closely together whenever they are closed.

The coupling-section j has a flange at the margin which centers the coupling parts 2', and one of the parts is provided with a series of four holes (Z into which pins upon the opposite section fit snugly. This also prevents any chattering.

lVhen the cap of the bearing (l' is opened, the nozzle can be slid endwise to separate the coupling-sections before the nozzle is lifted from its hearing.

The nozzle and the contained parts are thus rendered readily accessible for adjustment or repairs.

F ceding of grinder-wheel.

The nozzle-bearing (Z' requires feeding attachments to move the grinder-wheel laterally and longitudinally of the chuck, and the carriage c is therefore fitted movably to transverse guides C upon a slide R, which is movable lengthwise of the bed A. The carriage 0 has a screw 70 with handwheel is to move it and press the grinder against the sleeve to be ground, and the slide R has a has a rack 00 meshed with a pinion so, which is connected to suitable feed-gearing to propel the grinder into the chuck. V

When applyin the grinder to the sleeve, the feed-gearing is operated to propel the slide It slowly back and forth upon the bed A, and its motion is reversed, like that in ordinary ironlaners, by dogs y arranged to contact with a reversing-arm y (see Fig. 1) at the two limits of the desired movement.

The feed-gearing is disconnected (as by a lever 2) when the slide is to be moved by hand by a wheel 0%. A gaging device to indicate the diameter of the bore produced b the grinder is indicated in Figs. 1 and 2 by reference letters 0, 0, p, p, r, g, g, t, 25, but form no part of the present invention.

In like manner, electrical means for arresting the motion of the feed-carrier when the grinder is withdrawn from the sleeve is, in Fig. 2, indicated by the reference letters a, (Z, (Z, w and w but this device forms no part of the present invention.

Having thus set forth the nature of the invention what is claimed herein is:

1. In a grinding machine, the combination, with a spindle, of a tubular nozzle affixed to the carriage and inclosing the said spindle, and half-bearings fitted inside the nozzle to opposite sides of the spindle in oflset positions, to expose one side-surface of the spindle for lubrication at each bearing.

2. In a grinding machine, the combination, with a spindle, of a tubular nozzle affixed to the carriage and inclosing the said spindle, half-bearings fitted inside the nozzle to opposite sides of the spindle in offset positions, to expose one side-surface of the spindle, and an oil-inlet to fill the nozzle with oil and lubricate the said surfaces.

3. In a grinding machine, the combination, with a spindle, of a carriage, a tubular nozzle affixed to the carriage and inclosing the said spindle, and half-bearings fitted inside thenozzle at opposite sides of the spindle, the bearings upon one side of the spindle being fixed rigidly in the nozzle and the opposed bearings being provided with springs to press them and the spindle toward the fixed bearing.

4. In a grinding machine, the combination, with the spindle,'of a tubular nozzle inclosing the spindle and containing bearings fitted to the spindle,oand a carriage provided with a clamp-bearing to hold the nozzle removably in its operative position upon the carriage.

5. In a grinding machine, the combination, with a carriage, of a spindle, a nozzle tion, with a carriage, of a spindle, a nozinclosing the spindle and containing bearzle inclosing the spindle and containing 10 ings fitted to the spindle, a clamp-bearing bearings fitted to the spindle, and a clampfor holding the nozzle upon the carriage, bearing upon the carriage with hinged cap and an electric motor mounted upon the earand cam to clamp the cap upon the nozzle. riage With its arbor coupled detaehably to In testimony whereof I have hereunto set the said spindle. my hand.

6. In a grinding machine, the combina- CONRAD KNOTH. 

